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Christmas Bird Count, bird census for more than 100 years


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Each year in late December, more than 50,000 birders across North America participate in Audubon's annual Christmas Bird Count, the world's longest-running database in ornithology. First conducted in 1900, the Christmas Bird Count is a daylong census of bird populations. Each local count occurs within a 15-mile diameter circle. Participants count all the birds they can find within the circle in a 24-hour period.

Participants don't need to be an expert to participate, and they don't have to count for the entire day. Interested persons can participate for only a few hours, their contribution is welcome and important.

In any given year, there are about 50 Christmas Bird Counts in Washingto...

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